title: Phase transition and superconductivity of SrFe(2)As(2) under high pressure.
abstract: High pressure x-ray diffraction and electrical resistance measurements have been carried out on SrFe(2)As(2) to a pressure of 23 GPa and temperature of 10 K using a synchrotron source and designer diamond anvils. At ambient temperature, a phase transition from the tetragonal phase to a collapsed tetragonal (CT) phase is observed at 10 GPa under non-hydrostatic conditions. The experimental relation that T-CT transition pressure for 122 Fe-based superconductors is dependent on ambient pressure volume is affirmed. The superconducting transition temperature is observed at 32 K at 1.3 GPa and decreases rapidly with a further increase of pressure in the region where the T-CT transition occurs. Our results suggest that T(C) falls below 10 K in the pressure range of 10-18 GPa where the CT phase is expected to be stable.
authors.affiliation: Department of Physics, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
authors.forename: Walter O
authors.initials: WO
authors.lastname: Uhoya
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Montgomery
authors.forename: Georgiy M
authors.initials: GM
authors.lastname: Tsoi
authors.forename: Yogesh K
authors.initials: YK
authors.lastname: Vohra
authors.forename: M A
authors.initials: MA
authors.lastname: McGuire
authors.forename: Athena S
authors.initials: AS
authors.lastname: Sefat
authors.forename: Brian C
authors.initials: BC
authors.lastname: Sales
authors.forename: Samuel T
authors.initials: ST
authors.lastname: Weir